Hi Joshua! I just looked your engine up in my GM Performance Parts Catalog
and what you have is a 330 H.P. 350 H.O. engine. The engine has 380 Ft.Lbs.
torque @ 3800 R.P.M. and has a 4 bolt main. It has the 64 cc Vortec cast
iron heads, a nodular iron crankshaft, PM steel connecting rods and cast
aluminum pistons. The heads have 1.94" intake and 1.50" exhaust valves.
Maximum Recommended R.P.M. 5500
Compression Ratio: 9.1:1
650 cfm carburetor recommended
Given the reasonable compression ratio, "Regular" pump gas of 87 octane or
higher should suffice, but if you notice and run-on (dieseling) or pinging,
go a bit higher. Definitely no more than 91 octane would be required.
The engine comes from the factory with regular motor oil 10W30SG oil and
PF1218 ACDelco oil filter (PN 251605610). Synthetic oil is a matter of
personal choice, but I'd recommend it if the engine is already broken in.
From personal experience, I have a ZZ4 crate engine in one of my cars (355
H.P., 405 Ft.Lbs. torque) and I noticed an appreciable difference in
performance when I went to Mobil 1 synthetic after the break-in period. Some
people swear that their mileage improves with synthetic oil as well and this
makes sense because synthetic oil reduces friction in the engine.
The motor doesn't come with a power steering pump, so your pump is possibly
the stock one for the car. I'd suggest that you contact the person you
bought the car from and find out what the pump is out of and take it from
Here's a link that lists the parts in your engine:
Let me know if I can be of any further help.
It's in a 1981 Jeep CJ. The next thing most people say is "Wow, I bet
that thing must really move!" But due to the extremely low gearing
and large off road tires I can't do much over 50mph on the highway,
so you won't see me at the local drag strip. But I can climb a near
vertical rocky slope with it!! It's set up with a Holley ProJection
4di fuel injection system so I can get fuel to the engine when the
jeep is at odd off-road angles. I bought it already built this way
and have limited mechanical skill so I am trying to get up to speed.
Honestly I have never thought of that and no such mods have been made.
Usually it is just at a > 40 degree angle for a few seconds while
crawling up a steep embankment. Long enough that a carbureted engine
could stall, but not long enough to worry about the oil running out
of the engine.
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